WITHDRAWN - RECOMMENDATIONS NOT NEEDED ANYMORE. Topic addressed by EASA SIB 2011-15R3
Superseded. Comply with 2011-15R3, which replaces this document.
- Published
- Replaces
- 2011-15
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Since the recommendations are withdrawn and no longer mandatory, operators and owners are not required to take corrective action regarding ICAO 24-bit aircraft address settings or conduct the previously recommended ground testing. However, maintaining accurate transponder settings remains good practice. Stakeholders should monitor communications from their National Aviation Authority or Air Navigation Service Provider for any future updates.
Summary
WITHDRAWN - RECOMMENDATIONS NOT NEEDED ANYMORE is an EASA Safety Information Bulletin (SIB) originally issued as SIB 2011-14 addressing the incorrect setting of ICAO 24-bit aircraft addresses in Mode S transponders. It applies to all aircraft equipped with SSR Mode S transponders, including those certificated under FAR, JAR, and CS Parts 22, 23, 25, 27, 29, 31HB, VLA, or VLR. The bulletin highlights risks associated with duplicate or incorrect ICAO addresses affecting air traffic control identification and ACAS II performance.
What changed
This document withdraws the previous recommendations provided in EASA SIB 2011-15R3 concerning Mode S transponder ground testing and ICAO 24-bit address correctness. It indicates that the safety concerns identified are no longer considered to require mandatory action or Airworthiness Directives. The withdrawal means operators are no longer mandated to follow the earlier guidance for correcting transponder address issues.
Why it matters
For aviation professionals, this withdrawal clarifies that the previously identified risks related to duplicate ICAO 24-bit addresses in Mode S transponders are no longer deemed an unsafe condition requiring regulatory enforcement. Operators, maintenance organizations, and compliance teams can adjust their procedures accordingly, reducing administrative and operational burdens related to address verification and transponder ground testing.
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